1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
<?php
/**
* Piwik - free/libre analytics platform
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
*/
namespace Piwik;
/**
* Http helper: static file server proxy, with compression, caching, isHttps() helper...
*
* Used to server piwik.js and the merged+minified CSS and JS files
*
*/
class ProxyHttp
{
/**
* Returns true if the current request appears to be a secure HTTPS connection
*
* @return bool
*/
public static function isHttps()
{
return Url::getCurrentScheme() === 'https';
}
/**
* Serve static files through php proxy.
*
* It performs the following actions:
* - Checks the file is readable or returns "HTTP/1.0 404 Not Found"
* - Returns "HTTP/1.1 304 Not Modified" after comparing the HTTP_IF_MODIFIED_SINCE
* with the modification date of the static file
* - Will try to compress the static file according to HTTP_ACCEPT_ENCODING. Compressed files are store in
* the /tmp directory. If compressing extensions are not available, a manually gzip compressed file
* can be provided in the /tmp directory. It has to bear the same name with an added .gz extension.
* Using manually compressed static files requires you to manually update the compressed file when
* the static file is updated.
* - Overrides server cache control config to allow caching
* - Sends Very Accept-Encoding to tell proxies to store different version of the static file according
* to users encoding capacities.
*
* Warning:
* Compressed filed are stored in the /tmp directory.
* If this method is used with two files bearing the same name but located in different locations,
* there is a risk of conflict. One file could be served with the content of the other.
* A future upgrade of this method would be to recreate the directory structure of the static file
* within a /tmp/compressed-static-files directory.
*
* @param string $file The location of the static file to serve
* @param string $contentType The content type of the static file.
* @param bool $expireFarFuture Day in the far future to set the Expires header to.
* Should be set to false for files that should not be cached.
*/
public static function serverStaticFile($file, $contentType, $expireFarFutureDays = 100)
{
if (file_exists($file)) {
// conditional GET
$modifiedSince = '';
if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
$modifiedSince = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
// strip any trailing data appended to header
if (false !== ($semicolon = strpos($modifiedSince, ';'))) {
$modifiedSince = substr($modifiedSince, 0, $semicolon);
}
}
$fileModifiedTime = @filemtime($file);
$lastModified = gmdate('D, d M Y H:i:s', $fileModifiedTime) . ' GMT';
// set HTTP response headers
self::overrideCacheControlHeaders('public');
@header('Vary: Accept-Encoding');
@header('Content-Disposition: inline; filename=' . basename($file));
if ($expireFarFutureDays) {
// Required by proxy caches potentially in between the browser and server to cache the request indeed
@header("Expires: " . gmdate('D, d M Y H:i:s', time() + 86400 * (int)$expireFarFutureDays) . ' GMT');
}
// Returns 304 if not modified since
if ($modifiedSince === $lastModified) {
self::setHttpStatus('304 Not Modified');
} else {
// optional compression
$compressed = false;
$encoding = '';
$compressedFileLocation = AssetManager::getInstance()->getAssetDirectory() . '/' . basename($file);
$phpOutputCompressionEnabled = ProxyHttp::isPhpOutputCompressed();
if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && !$phpOutputCompressionEnabled) {
$acceptEncoding = $_SERVER['HTTP_ACCEPT_ENCODING'];
if (extension_loaded('zlib') && function_exists('file_get_contents') && function_exists('file_put_contents')) {
if (preg_match('/(?:^|, ?)(deflate)(?:,|$)/', $acceptEncoding, $matches)) {
$encoding = 'deflate';
$filegz = $compressedFileLocation . '.deflate';
} else if (preg_match('/(?:^|, ?)((x-)?gzip)(?:,|$)/', $acceptEncoding, $matches)) {
$encoding = $matches[1];
$filegz = $compressedFileLocation . '.gz';
}
if (!empty($encoding)) {
// compress-on-demand and use cache
if (!file_exists($filegz) || ($fileModifiedTime > @filemtime($filegz))) {
$data = file_get_contents($file);
if ($encoding == 'deflate') {
$data = gzdeflate($data, 9);
} else if ($encoding == 'gzip' || $encoding == 'x-gzip') {
$data = gzencode($data, 9);
}
file_put_contents($filegz, $data);
}
$compressed = true;
$file = $filegz;
}
} else {
// manually compressed
$filegz = $compressedFileLocation . '.gz';
if (preg_match('/(?:^|, ?)((x-)?gzip)(?:,|$)/', $acceptEncoding, $matches) && file_exists($filegz) && ($fileModifiedTime < @filemtime($filegz))) {
$encoding = $matches[1];
$compressed = true;
$file = $filegz;
}
}
}
@header('Last-Modified: ' . $lastModified);
if (!$phpOutputCompressionEnabled) {
@header('Content-Length: ' . filesize($file));
}
if (!empty($contentType)) {
@header('Content-Type: ' . $contentType);
}
if ($compressed) {
@header('Content-Encoding: ' . $encoding);
}
if (!_readfile($file)) {
self::setHttpStatus('505 Internal server error');
}
}
} else {
self::setHttpStatus('404 Not Found');
}
}
/**
* Test if php output is compressed
*
* @return bool True if php output is (or suspected/likely) to be compressed
*/
public static function isPhpOutputCompressed()
{
// Off = ''; On = '1'; otherwise, it's a buffer size
$zlibOutputCompression = ini_get('zlib.output_compression');
// could be ob_gzhandler, ob_deflatehandler, etc
$outputHandler = ini_get('output_handler');
// output handlers can be stacked
$obHandlers = array_filter(ob_list_handlers(), function ($var) {
return $var !== "default output handler";
});
// user defined handler via wrapper
if (!defined('PIWIK_TEST_MODE')) {
$autoPrependFile = ini_get('auto_prepend_file');
$autoAppendFile = ini_get('auto_append_file');
}
return !empty($zlibOutputCompression) ||
!empty($outputHandler) ||
!empty($obHandlers) ||
!empty($autoPrependFile) ||
!empty($autoAppendFile);
}
/**
* Workaround IE bug when downloading certain document types over SSL and
* cache control headers are present, e.g.,
*
* Cache-Control: no-cache
* Cache-Control: no-store,max-age=0,must-revalidate
* Pragma: no-cache
*
* @see http://support.microsoft.com/kb/316431/
* @see RFC2616
*
* @param string $override One of "public", "private", "no-cache", or "no-store". (optional)
*/
public static function overrideCacheControlHeaders($override = null)
{
if ($override || self::isHttps()) {
@header('Pragma: ');
@header('Expires: ');
if (in_array($override, array('public', 'private', 'no-cache', 'no-store'))) {
@header("Cache-Control: $override, must-revalidate");
} else {
@header('Cache-Control: must-revalidate');
}
}
}
/**
* Set response header, e.g., HTTP/1.0 200 Ok
*
* @param string $status Status
* @return bool
*/
protected static function setHttpStatus($status)
{
if (strpos(PHP_SAPI, '-fcgi') === false) {
@header($_SERVER['SERVER_PROTOCOL'] . ' ' . $status);
} else {
// FastCGI
@header('Status: ' . $status);
}
}
}
|
